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1/*
2 * NFS server file handle treatment.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
6 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
7 * ... and again Southern-Winter 2001 to support export_operations
8 */
9
10#include <linux/exportfs.h>
11
12#include <linux/sunrpc/svcauth_gss.h>
13#include "nfsd.h"
14#include "vfs.h"
15#include "auth.h"
16
17#define NFSDDBG_FACILITY NFSDDBG_FH
18
19
20/*
21 * our acceptability function.
22 * if NOSUBTREECHECK, accept anything
23 * if not, require that we can walk up to exp->ex_dentry
24 * doing some checks on the 'x' bits
25 */
26static int nfsd_acceptable(void *expv, struct dentry *dentry)
27{
28 struct svc_export *exp = expv;
29 int rv;
30 struct dentry *tdentry;
31 struct dentry *parent;
32
33 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
34 return 1;
35
36 tdentry = dget(dentry);
37 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
38 /* make sure parents give x permission to user */
39 int err;
40 parent = dget_parent(tdentry);
41 err = inode_permission(parent->d_inode, MAY_EXEC);
42 if (err < 0) {
43 dput(parent);
44 break;
45 }
46 dput(tdentry);
47 tdentry = parent;
48 }
49 if (tdentry != exp->ex_path.dentry)
50 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
51 rv = (tdentry == exp->ex_path.dentry);
52 dput(tdentry);
53 return rv;
54}
55
56/* Type check. The correct error return for type mismatches does not seem to be
57 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
58 * comment in the NFSv3 spec says this is incorrect (implementation notes for
59 * the write call).
60 */
61static inline __be32
62nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, umode_t requested)
63{
64 mode &= S_IFMT;
65
66 if (requested == 0) /* the caller doesn't care */
67 return nfs_ok;
68 if (mode == requested)
69 return nfs_ok;
70 /*
71 * v4 has an error more specific than err_notdir which we should
72 * return in preference to err_notdir:
73 */
74 if (rqstp->rq_vers == 4 && mode == S_IFLNK)
75 return nfserr_symlink;
76 if (requested == S_IFDIR)
77 return nfserr_notdir;
78 if (mode == S_IFDIR)
79 return nfserr_isdir;
80 return nfserr_inval;
81}
82
83static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
84 struct svc_export *exp)
85{
86 int flags = nfsexp_flags(rqstp, exp);
87
88 /* Check if the request originated from a secure port. */
89 if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) {
90 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
91 dprintk(KERN_WARNING
92 "nfsd: request from insecure port %s!\n",
93 svc_print_addr(rqstp, buf, sizeof(buf)));
94 return nfserr_perm;
95 }
96
97 /* Set user creds for this exportpoint */
98 return nfserrno(nfsd_setuser(rqstp, exp));
99}
100
101static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
102 struct dentry *dentry, struct svc_export *exp)
103{
104 if (!(exp->ex_flags & NFSEXP_V4ROOT))
105 return nfs_ok;
106 /*
107 * v2/v3 clients have no need for the V4ROOT export--they use
108 * the mount protocl instead; also, further V4ROOT checks may be
109 * in v4-specific code, in which case v2/v3 clients could bypass
110 * them.
111 */
112 if (!nfsd_v4client(rqstp))
113 return nfserr_stale;
114 /*
115 * We're exposing only the directories and symlinks that have to be
116 * traversed on the way to real exports:
117 */
118 if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) &&
119 !S_ISLNK(dentry->d_inode->i_mode)))
120 return nfserr_stale;
121 /*
122 * A pseudoroot export gives permission to access only one
123 * single directory; the kernel has to make another upcall
124 * before granting access to anything else under it:
125 */
126 if (unlikely(dentry != exp->ex_path.dentry))
127 return nfserr_stale;
128 return nfs_ok;
129}
130
131/*
132 * Use the given filehandle to look up the corresponding export and
133 * dentry. On success, the results are used to set fh_export and
134 * fh_dentry.
135 */
136static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
137{
138 struct knfsd_fh *fh = &fhp->fh_handle;
139 struct fid *fid = NULL, sfid;
140 struct svc_export *exp;
141 struct dentry *dentry;
142 int fileid_type;
143 int data_left = fh->fh_size/4;
144 __be32 error;
145
146 error = nfserr_stale;
147 if (rqstp->rq_vers > 2)
148 error = nfserr_badhandle;
149 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
150 return nfserr_nofilehandle;
151
152 if (fh->fh_version == 1) {
153 int len;
154
155 if (--data_left < 0)
156 return error;
157 if (fh->fh_auth_type != 0)
158 return error;
159 len = key_len(fh->fh_fsid_type) / 4;
160 if (len == 0)
161 return error;
162 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
163 /* deprecated, convert to type 3 */
164 len = key_len(FSID_ENCODE_DEV)/4;
165 fh->fh_fsid_type = FSID_ENCODE_DEV;
166 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
167 fh->fh_fsid[1] = fh->fh_fsid[2];
168 }
169 data_left -= len;
170 if (data_left < 0)
171 return error;
172 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
173 fid = (struct fid *)(fh->fh_auth + len);
174 } else {
175 __u32 tfh[2];
176 dev_t xdev;
177 ino_t xino;
178
179 if (fh->fh_size != NFS_FHSIZE)
180 return error;
181 /* assume old filehandle format */
182 xdev = old_decode_dev(fh->ofh_xdev);
183 xino = u32_to_ino_t(fh->ofh_xino);
184 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
185 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
186 }
187
188 error = nfserr_stale;
189 if (PTR_ERR(exp) == -ENOENT)
190 return error;
191
192 if (IS_ERR(exp))
193 return nfserrno(PTR_ERR(exp));
194
195 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
196 /* Elevate privileges so that the lack of 'r' or 'x'
197 * permission on some parent directory will
198 * not stop exportfs_decode_fh from being able
199 * to reconnect a directory into the dentry cache.
200 * The same problem can affect "SUBTREECHECK" exports,
201 * but as nfsd_acceptable depends on correct
202 * access control settings being in effect, we cannot
203 * fix that case easily.
204 */
205 struct cred *new = prepare_creds();
206 if (!new)
207 return nfserrno(-ENOMEM);
208 new->cap_effective =
209 cap_raise_nfsd_set(new->cap_effective,
210 new->cap_permitted);
211 put_cred(override_creds(new));
212 put_cred(new);
213 } else {
214 error = nfsd_setuser_and_check_port(rqstp, exp);
215 if (error)
216 goto out;
217 }
218
219 /*
220 * Look up the dentry using the NFS file handle.
221 */
222 error = nfserr_stale;
223 if (rqstp->rq_vers > 2)
224 error = nfserr_badhandle;
225
226 if (fh->fh_version != 1) {
227 sfid.i32.ino = fh->ofh_ino;
228 sfid.i32.gen = fh->ofh_generation;
229 sfid.i32.parent_ino = fh->ofh_dirino;
230 fid = &sfid;
231 data_left = 3;
232 if (fh->ofh_dirino == 0)
233 fileid_type = FILEID_INO32_GEN;
234 else
235 fileid_type = FILEID_INO32_GEN_PARENT;
236 } else
237 fileid_type = fh->fh_fileid_type;
238
239 if (fileid_type == FILEID_ROOT)
240 dentry = dget(exp->ex_path.dentry);
241 else {
242 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
243 data_left, fileid_type,
244 nfsd_acceptable, exp);
245 }
246 if (dentry == NULL)
247 goto out;
248 if (IS_ERR(dentry)) {
249 if (PTR_ERR(dentry) != -EINVAL)
250 error = nfserrno(PTR_ERR(dentry));
251 goto out;
252 }
253
254 if (S_ISDIR(dentry->d_inode->i_mode) &&
255 (dentry->d_flags & DCACHE_DISCONNECTED)) {
256 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
257 dentry->d_parent->d_name.name, dentry->d_name.name);
258 }
259
260 fhp->fh_dentry = dentry;
261 fhp->fh_export = exp;
262 return 0;
263out:
264 exp_put(exp);
265 return error;
266}
267
268/**
269 * fh_verify - filehandle lookup and access checking
270 * @rqstp: pointer to current rpc request
271 * @fhp: filehandle to be verified
272 * @type: expected type of object pointed to by filehandle
273 * @access: type of access needed to object
274 *
275 * Look up a dentry from the on-the-wire filehandle, check the client's
276 * access to the export, and set the current task's credentials.
277 *
278 * Regardless of success or failure of fh_verify(), fh_put() should be
279 * called on @fhp when the caller is finished with the filehandle.
280 *
281 * fh_verify() may be called multiple times on a given filehandle, for
282 * example, when processing an NFSv4 compound. The first call will look
283 * up a dentry using the on-the-wire filehandle. Subsequent calls will
284 * skip the lookup and just perform the other checks and possibly change
285 * the current task's credentials.
286 *
287 * @type specifies the type of object expected using one of the S_IF*
288 * constants defined in include/linux/stat.h. The caller may use zero
289 * to indicate that it doesn't care, or a negative integer to indicate
290 * that it expects something not of the given type.
291 *
292 * @access is formed from the NFSD_MAY_* constants defined in
293 * include/linux/nfsd/nfsd.h.
294 */
295__be32
296fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, umode_t type, int access)
297{
298 struct svc_export *exp;
299 struct dentry *dentry;
300 __be32 error;
301
302 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
303
304 if (!fhp->fh_dentry) {
305 error = nfsd_set_fh_dentry(rqstp, fhp);
306 if (error)
307 goto out;
308 }
309 dentry = fhp->fh_dentry;
310 exp = fhp->fh_export;
311 /*
312 * We still have to do all these permission checks, even when
313 * fh_dentry is already set:
314 * - fh_verify may be called multiple times with different
315 * "access" arguments (e.g. nfsd_proc_create calls
316 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in
317 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
318 * - in the NFSv4 case, the filehandle may have been filled
319 * in by fh_compose, and given a dentry, but further
320 * compound operations performed with that filehandle
321 * still need permissions checks. In the worst case, a
322 * mountpoint crossing may have changed the export
323 * options, and we may now need to use a different uid
324 * (for example, if different id-squashing options are in
325 * effect on the new filesystem).
326 */
327 error = check_pseudo_root(rqstp, dentry, exp);
328 if (error)
329 goto out;
330
331 error = nfsd_setuser_and_check_port(rqstp, exp);
332 if (error)
333 goto out;
334
335 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
336 if (error)
337 goto out;
338
339 /*
340 * pseudoflavor restrictions are not enforced on NLM,
341 * which clients virtually always use auth_sys for,
342 * even while using RPCSEC_GSS for NFS.
343 */
344 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
345 goto skip_pseudoflavor_check;
346 /*
347 * Clients may expect to be able to use auth_sys during mount,
348 * even if they use gss for everything else; see section 2.3.2
349 * of rfc 2623.
350 */
351 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
352 && exp->ex_path.dentry == dentry)
353 goto skip_pseudoflavor_check;
354
355 error = check_nfsd_access(exp, rqstp);
356 if (error)
357 goto out;
358
359skip_pseudoflavor_check:
360 /* Finally, check access permissions. */
361 error = nfsd_permission(rqstp, exp, dentry, access);
362
363 if (error) {
364 dprintk("fh_verify: %s/%s permission failure, "
365 "acc=%x, error=%d\n",
366 dentry->d_parent->d_name.name,
367 dentry->d_name.name,
368 access, ntohl(error));
369 }
370out:
371 if (error == nfserr_stale)
372 nfsdstats.fh_stale++;
373 return error;
374}
375
376
377/*
378 * Compose a file handle for an NFS reply.
379 *
380 * Note that when first composed, the dentry may not yet have
381 * an inode. In this case a call to fh_update should be made
382 * before the fh goes out on the wire ...
383 */
384static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
385 struct dentry *dentry)
386{
387 if (dentry != exp->ex_path.dentry) {
388 struct fid *fid = (struct fid *)
389 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
390 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
391 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
392
393 fhp->fh_handle.fh_fileid_type =
394 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
395 fhp->fh_handle.fh_size += maxsize * 4;
396 } else {
397 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
398 }
399}
400
401/*
402 * for composing old style file handles
403 */
404static inline void _fh_update_old(struct dentry *dentry,
405 struct svc_export *exp,
406 struct knfsd_fh *fh)
407{
408 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
409 fh->ofh_generation = dentry->d_inode->i_generation;
410 if (S_ISDIR(dentry->d_inode->i_mode) ||
411 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
412 fh->ofh_dirino = 0;
413}
414
415static bool is_root_export(struct svc_export *exp)
416{
417 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
418}
419
420static struct super_block *exp_sb(struct svc_export *exp)
421{
422 return exp->ex_path.dentry->d_inode->i_sb;
423}
424
425static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
426{
427 switch (fsid_type) {
428 case FSID_DEV:
429 if (!old_valid_dev(exp_sb(exp)->s_dev))
430 return 0;
431 /* FALL THROUGH */
432 case FSID_MAJOR_MINOR:
433 case FSID_ENCODE_DEV:
434 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
435 case FSID_NUM:
436 return exp->ex_flags & NFSEXP_FSID;
437 case FSID_UUID8:
438 case FSID_UUID16:
439 if (!is_root_export(exp))
440 return 0;
441 /* fall through */
442 case FSID_UUID4_INUM:
443 case FSID_UUID16_INUM:
444 return exp->ex_uuid != NULL;
445 }
446 return 1;
447}
448
449
450static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
451{
452 u8 version;
453 u8 fsid_type;
454retry:
455 version = 1;
456 if (ref_fh && ref_fh->fh_export == exp) {
457 version = ref_fh->fh_handle.fh_version;
458 fsid_type = ref_fh->fh_handle.fh_fsid_type;
459
460 ref_fh = NULL;
461
462 switch (version) {
463 case 0xca:
464 fsid_type = FSID_DEV;
465 break;
466 case 1:
467 break;
468 default:
469 goto retry;
470 }
471
472 /*
473 * As the fsid -> filesystem mapping was guided by
474 * user-space, there is no guarantee that the filesystem
475 * actually supports that fsid type. If it doesn't we
476 * loop around again without ref_fh set.
477 */
478 if (!fsid_type_ok_for_exp(fsid_type, exp))
479 goto retry;
480 } else if (exp->ex_flags & NFSEXP_FSID) {
481 fsid_type = FSID_NUM;
482 } else if (exp->ex_uuid) {
483 if (fhp->fh_maxsize >= 64) {
484 if (is_root_export(exp))
485 fsid_type = FSID_UUID16;
486 else
487 fsid_type = FSID_UUID16_INUM;
488 } else {
489 if (is_root_export(exp))
490 fsid_type = FSID_UUID8;
491 else
492 fsid_type = FSID_UUID4_INUM;
493 }
494 } else if (!old_valid_dev(exp_sb(exp)->s_dev))
495 /* for newer device numbers, we must use a newer fsid format */
496 fsid_type = FSID_ENCODE_DEV;
497 else
498 fsid_type = FSID_DEV;
499 fhp->fh_handle.fh_version = version;
500 if (version)
501 fhp->fh_handle.fh_fsid_type = fsid_type;
502}
503
504__be32
505fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
506 struct svc_fh *ref_fh)
507{
508 /* ref_fh is a reference file handle.
509 * if it is non-null and for the same filesystem, then we should compose
510 * a filehandle which is of the same version, where possible.
511 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
512 * Then create a 32byte filehandle using nfs_fhbase_old
513 *
514 */
515
516 struct inode * inode = dentry->d_inode;
517 struct dentry *parent = dentry->d_parent;
518 __u32 *datap;
519 dev_t ex_dev = exp_sb(exp)->s_dev;
520
521 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
522 MAJOR(ex_dev), MINOR(ex_dev),
523 (long) exp->ex_path.dentry->d_inode->i_ino,
524 parent->d_name.name, dentry->d_name.name,
525 (inode ? inode->i_ino : 0));
526
527 /* Choose filehandle version and fsid type based on
528 * the reference filehandle (if it is in the same export)
529 * or the export options.
530 */
531 set_version_and_fsid_type(fhp, exp, ref_fh);
532
533 if (ref_fh == fhp)
534 fh_put(ref_fh);
535
536 if (fhp->fh_locked || fhp->fh_dentry) {
537 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
538 parent->d_name.name, dentry->d_name.name);
539 }
540 if (fhp->fh_maxsize < NFS_FHSIZE)
541 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
542 fhp->fh_maxsize,
543 parent->d_name.name, dentry->d_name.name);
544
545 fhp->fh_dentry = dget(dentry); /* our internal copy */
546 fhp->fh_export = exp;
547 cache_get(&exp->h);
548
549 if (fhp->fh_handle.fh_version == 0xca) {
550 /* old style filehandle please */
551 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
552 fhp->fh_handle.fh_size = NFS_FHSIZE;
553 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
554 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
555 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
556 fhp->fh_handle.ofh_xino =
557 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
558 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
559 if (inode)
560 _fh_update_old(dentry, exp, &fhp->fh_handle);
561 } else {
562 int len;
563 fhp->fh_handle.fh_auth_type = 0;
564 datap = fhp->fh_handle.fh_auth+0;
565 mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
566 exp->ex_path.dentry->d_inode->i_ino,
567 exp->ex_fsid, exp->ex_uuid);
568
569 len = key_len(fhp->fh_handle.fh_fsid_type);
570 datap += len/4;
571 fhp->fh_handle.fh_size = 4 + len;
572
573 if (inode)
574 _fh_update(fhp, exp, dentry);
575 if (fhp->fh_handle.fh_fileid_type == 255) {
576 fh_put(fhp);
577 return nfserr_opnotsupp;
578 }
579 }
580
581 return 0;
582}
583
584/*
585 * Update file handle information after changing a dentry.
586 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
587 */
588__be32
589fh_update(struct svc_fh *fhp)
590{
591 struct dentry *dentry;
592
593 if (!fhp->fh_dentry)
594 goto out_bad;
595
596 dentry = fhp->fh_dentry;
597 if (!dentry->d_inode)
598 goto out_negative;
599 if (fhp->fh_handle.fh_version != 1) {
600 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
601 } else {
602 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
603 goto out;
604
605 _fh_update(fhp, fhp->fh_export, dentry);
606 if (fhp->fh_handle.fh_fileid_type == 255)
607 return nfserr_opnotsupp;
608 }
609out:
610 return 0;
611
612out_bad:
613 printk(KERN_ERR "fh_update: fh not verified!\n");
614 goto out;
615out_negative:
616 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
617 dentry->d_parent->d_name.name, dentry->d_name.name);
618 goto out;
619}
620
621/*
622 * Release a file handle.
623 */
624void
625fh_put(struct svc_fh *fhp)
626{
627 struct dentry * dentry = fhp->fh_dentry;
628 struct svc_export * exp = fhp->fh_export;
629 if (dentry) {
630 fh_unlock(fhp);
631 fhp->fh_dentry = NULL;
632 dput(dentry);
633#ifdef CONFIG_NFSD_V3
634 fhp->fh_pre_saved = 0;
635 fhp->fh_post_saved = 0;
636#endif
637 }
638 if (exp) {
639 exp_put(exp);
640 fhp->fh_export = NULL;
641 }
642 return;
643}
644
645/*
646 * Shorthand for dprintk()'s
647 */
648char * SVCFH_fmt(struct svc_fh *fhp)
649{
650 struct knfsd_fh *fh = &fhp->fh_handle;
651
652 static char buf[80];
653 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
654 fh->fh_size,
655 fh->fh_base.fh_pad[0],
656 fh->fh_base.fh_pad[1],
657 fh->fh_base.fh_pad[2],
658 fh->fh_base.fh_pad[3],
659 fh->fh_base.fh_pad[4],
660 fh->fh_base.fh_pad[5]);
661 return buf;
662}
663
664enum fsid_source fsid_source(struct svc_fh *fhp)
665{
666 if (fhp->fh_handle.fh_version != 1)
667 return FSIDSOURCE_DEV;
668 switch(fhp->fh_handle.fh_fsid_type) {
669 case FSID_DEV:
670 case FSID_ENCODE_DEV:
671 case FSID_MAJOR_MINOR:
672 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
673 return FSIDSOURCE_DEV;
674 break;
675 case FSID_NUM:
676 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
677 return FSIDSOURCE_FSID;
678 break;
679 default:
680 break;
681 }
682 /* either a UUID type filehandle, or the filehandle doesn't
683 * match the export.
684 */
685 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
686 return FSIDSOURCE_FSID;
687 if (fhp->fh_export->ex_uuid)
688 return FSIDSOURCE_UUID;
689 return FSIDSOURCE_DEV;
690}
1/*
2 * NFS server file handle treatment.
3 *
4 * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
5 * Portions Copyright (C) 1999 G. Allen Morris III <gam3@acm.org>
6 * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
7 * ... and again Southern-Winter 2001 to support export_operations
8 */
9
10#include <linux/exportfs.h>
11
12#include <linux/sunrpc/svcauth_gss.h>
13#include "nfsd.h"
14#include "vfs.h"
15#include "auth.h"
16
17#define NFSDDBG_FACILITY NFSDDBG_FH
18
19
20/*
21 * our acceptability function.
22 * if NOSUBTREECHECK, accept anything
23 * if not, require that we can walk up to exp->ex_dentry
24 * doing some checks on the 'x' bits
25 */
26static int nfsd_acceptable(void *expv, struct dentry *dentry)
27{
28 struct svc_export *exp = expv;
29 int rv;
30 struct dentry *tdentry;
31 struct dentry *parent;
32
33 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)
34 return 1;
35
36 tdentry = dget(dentry);
37 while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {
38 /* make sure parents give x permission to user */
39 int err;
40 parent = dget_parent(tdentry);
41 err = inode_permission(parent->d_inode, MAY_EXEC);
42 if (err < 0) {
43 dput(parent);
44 break;
45 }
46 dput(tdentry);
47 tdentry = parent;
48 }
49 if (tdentry != exp->ex_path.dentry)
50 dprintk("nfsd_acceptable failed at %p %s\n", tdentry, tdentry->d_name.name);
51 rv = (tdentry == exp->ex_path.dentry);
52 dput(tdentry);
53 return rv;
54}
55
56/* Type check. The correct error return for type mismatches does not seem to be
57 * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
58 * comment in the NFSv3 spec says this is incorrect (implementation notes for
59 * the write call).
60 */
61static inline __be32
62nfsd_mode_check(struct svc_rqst *rqstp, umode_t mode, int type)
63{
64 /* Type can be negative when creating hardlinks - not to a dir */
65 if (type > 0 && (mode & S_IFMT) != type) {
66 if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
67 return nfserr_symlink;
68 else if (type == S_IFDIR)
69 return nfserr_notdir;
70 else if ((mode & S_IFMT) == S_IFDIR)
71 return nfserr_isdir;
72 else
73 return nfserr_inval;
74 }
75 if (type < 0 && (mode & S_IFMT) == -type) {
76 if (rqstp->rq_vers == 4 && (mode & S_IFMT) == S_IFLNK)
77 return nfserr_symlink;
78 else if (type == -S_IFDIR)
79 return nfserr_isdir;
80 else
81 return nfserr_notdir;
82 }
83 return 0;
84}
85
86static __be32 nfsd_setuser_and_check_port(struct svc_rqst *rqstp,
87 struct svc_export *exp)
88{
89 int flags = nfsexp_flags(rqstp, exp);
90
91 /* Check if the request originated from a secure port. */
92 if (!rqstp->rq_secure && !(flags & NFSEXP_INSECURE_PORT)) {
93 RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]);
94 dprintk(KERN_WARNING
95 "nfsd: request from insecure port %s!\n",
96 svc_print_addr(rqstp, buf, sizeof(buf)));
97 return nfserr_perm;
98 }
99
100 /* Set user creds for this exportpoint */
101 return nfserrno(nfsd_setuser(rqstp, exp));
102}
103
104static inline __be32 check_pseudo_root(struct svc_rqst *rqstp,
105 struct dentry *dentry, struct svc_export *exp)
106{
107 if (!(exp->ex_flags & NFSEXP_V4ROOT))
108 return nfs_ok;
109 /*
110 * v2/v3 clients have no need for the V4ROOT export--they use
111 * the mount protocl instead; also, further V4ROOT checks may be
112 * in v4-specific code, in which case v2/v3 clients could bypass
113 * them.
114 */
115 if (!nfsd_v4client(rqstp))
116 return nfserr_stale;
117 /*
118 * We're exposing only the directories and symlinks that have to be
119 * traversed on the way to real exports:
120 */
121 if (unlikely(!S_ISDIR(dentry->d_inode->i_mode) &&
122 !S_ISLNK(dentry->d_inode->i_mode)))
123 return nfserr_stale;
124 /*
125 * A pseudoroot export gives permission to access only one
126 * single directory; the kernel has to make another upcall
127 * before granting access to anything else under it:
128 */
129 if (unlikely(dentry != exp->ex_path.dentry))
130 return nfserr_stale;
131 return nfs_ok;
132}
133
134/*
135 * Use the given filehandle to look up the corresponding export and
136 * dentry. On success, the results are used to set fh_export and
137 * fh_dentry.
138 */
139static __be32 nfsd_set_fh_dentry(struct svc_rqst *rqstp, struct svc_fh *fhp)
140{
141 struct knfsd_fh *fh = &fhp->fh_handle;
142 struct fid *fid = NULL, sfid;
143 struct svc_export *exp;
144 struct dentry *dentry;
145 int fileid_type;
146 int data_left = fh->fh_size/4;
147 __be32 error;
148
149 error = nfserr_stale;
150 if (rqstp->rq_vers > 2)
151 error = nfserr_badhandle;
152 if (rqstp->rq_vers == 4 && fh->fh_size == 0)
153 return nfserr_nofilehandle;
154
155 if (fh->fh_version == 1) {
156 int len;
157
158 if (--data_left < 0)
159 return error;
160 if (fh->fh_auth_type != 0)
161 return error;
162 len = key_len(fh->fh_fsid_type) / 4;
163 if (len == 0)
164 return error;
165 if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {
166 /* deprecated, convert to type 3 */
167 len = key_len(FSID_ENCODE_DEV)/4;
168 fh->fh_fsid_type = FSID_ENCODE_DEV;
169 fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl(fh->fh_fsid[0]), ntohl(fh->fh_fsid[1])));
170 fh->fh_fsid[1] = fh->fh_fsid[2];
171 }
172 data_left -= len;
173 if (data_left < 0)
174 return error;
175 exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_auth);
176 fid = (struct fid *)(fh->fh_auth + len);
177 } else {
178 __u32 tfh[2];
179 dev_t xdev;
180 ino_t xino;
181
182 if (fh->fh_size != NFS_FHSIZE)
183 return error;
184 /* assume old filehandle format */
185 xdev = old_decode_dev(fh->ofh_xdev);
186 xino = u32_to_ino_t(fh->ofh_xino);
187 mk_fsid(FSID_DEV, tfh, xdev, xino, 0, NULL);
188 exp = rqst_exp_find(rqstp, FSID_DEV, tfh);
189 }
190
191 error = nfserr_stale;
192 if (PTR_ERR(exp) == -ENOENT)
193 return error;
194
195 if (IS_ERR(exp))
196 return nfserrno(PTR_ERR(exp));
197
198 if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {
199 /* Elevate privileges so that the lack of 'r' or 'x'
200 * permission on some parent directory will
201 * not stop exportfs_decode_fh from being able
202 * to reconnect a directory into the dentry cache.
203 * The same problem can affect "SUBTREECHECK" exports,
204 * but as nfsd_acceptable depends on correct
205 * access control settings being in effect, we cannot
206 * fix that case easily.
207 */
208 struct cred *new = prepare_creds();
209 if (!new)
210 return nfserrno(-ENOMEM);
211 new->cap_effective =
212 cap_raise_nfsd_set(new->cap_effective,
213 new->cap_permitted);
214 put_cred(override_creds(new));
215 put_cred(new);
216 } else {
217 error = nfsd_setuser_and_check_port(rqstp, exp);
218 if (error)
219 goto out;
220 }
221
222 /*
223 * Look up the dentry using the NFS file handle.
224 */
225 error = nfserr_stale;
226 if (rqstp->rq_vers > 2)
227 error = nfserr_badhandle;
228
229 if (fh->fh_version != 1) {
230 sfid.i32.ino = fh->ofh_ino;
231 sfid.i32.gen = fh->ofh_generation;
232 sfid.i32.parent_ino = fh->ofh_dirino;
233 fid = &sfid;
234 data_left = 3;
235 if (fh->ofh_dirino == 0)
236 fileid_type = FILEID_INO32_GEN;
237 else
238 fileid_type = FILEID_INO32_GEN_PARENT;
239 } else
240 fileid_type = fh->fh_fileid_type;
241
242 if (fileid_type == FILEID_ROOT)
243 dentry = dget(exp->ex_path.dentry);
244 else {
245 dentry = exportfs_decode_fh(exp->ex_path.mnt, fid,
246 data_left, fileid_type,
247 nfsd_acceptable, exp);
248 }
249 if (dentry == NULL)
250 goto out;
251 if (IS_ERR(dentry)) {
252 if (PTR_ERR(dentry) != -EINVAL)
253 error = nfserrno(PTR_ERR(dentry));
254 goto out;
255 }
256
257 if (S_ISDIR(dentry->d_inode->i_mode) &&
258 (dentry->d_flags & DCACHE_DISCONNECTED)) {
259 printk("nfsd: find_fh_dentry returned a DISCONNECTED directory: %s/%s\n",
260 dentry->d_parent->d_name.name, dentry->d_name.name);
261 }
262
263 fhp->fh_dentry = dentry;
264 fhp->fh_export = exp;
265 return 0;
266out:
267 exp_put(exp);
268 return error;
269}
270
271/**
272 * fh_verify - filehandle lookup and access checking
273 * @rqstp: pointer to current rpc request
274 * @fhp: filehandle to be verified
275 * @type: expected type of object pointed to by filehandle
276 * @access: type of access needed to object
277 *
278 * Look up a dentry from the on-the-wire filehandle, check the client's
279 * access to the export, and set the current task's credentials.
280 *
281 * Regardless of success or failure of fh_verify(), fh_put() should be
282 * called on @fhp when the caller is finished with the filehandle.
283 *
284 * fh_verify() may be called multiple times on a given filehandle, for
285 * example, when processing an NFSv4 compound. The first call will look
286 * up a dentry using the on-the-wire filehandle. Subsequent calls will
287 * skip the lookup and just perform the other checks and possibly change
288 * the current task's credentials.
289 *
290 * @type specifies the type of object expected using one of the S_IF*
291 * constants defined in include/linux/stat.h. The caller may use zero
292 * to indicate that it doesn't care, or a negative integer to indicate
293 * that it expects something not of the given type.
294 *
295 * @access is formed from the NFSD_MAY_* constants defined in
296 * include/linux/nfsd/nfsd.h.
297 */
298__be32
299fh_verify(struct svc_rqst *rqstp, struct svc_fh *fhp, int type, int access)
300{
301 struct svc_export *exp;
302 struct dentry *dentry;
303 __be32 error;
304
305 dprintk("nfsd: fh_verify(%s)\n", SVCFH_fmt(fhp));
306
307 if (!fhp->fh_dentry) {
308 error = nfsd_set_fh_dentry(rqstp, fhp);
309 if (error)
310 goto out;
311 }
312 dentry = fhp->fh_dentry;
313 exp = fhp->fh_export;
314 /*
315 * We still have to do all these permission checks, even when
316 * fh_dentry is already set:
317 * - fh_verify may be called multiple times with different
318 * "access" arguments (e.g. nfsd_proc_create calls
319 * fh_verify(...,NFSD_MAY_EXEC) first, then later (in
320 * nfsd_create) calls fh_verify(...,NFSD_MAY_CREATE).
321 * - in the NFSv4 case, the filehandle may have been filled
322 * in by fh_compose, and given a dentry, but further
323 * compound operations performed with that filehandle
324 * still need permissions checks. In the worst case, a
325 * mountpoint crossing may have changed the export
326 * options, and we may now need to use a different uid
327 * (for example, if different id-squashing options are in
328 * effect on the new filesystem).
329 */
330 error = check_pseudo_root(rqstp, dentry, exp);
331 if (error)
332 goto out;
333
334 error = nfsd_setuser_and_check_port(rqstp, exp);
335 if (error)
336 goto out;
337
338 error = nfsd_mode_check(rqstp, dentry->d_inode->i_mode, type);
339 if (error)
340 goto out;
341
342 /*
343 * pseudoflavor restrictions are not enforced on NLM,
344 * which clients virtually always use auth_sys for,
345 * even while using RPCSEC_GSS for NFS.
346 */
347 if (access & NFSD_MAY_LOCK || access & NFSD_MAY_BYPASS_GSS)
348 goto skip_pseudoflavor_check;
349 /*
350 * Clients may expect to be able to use auth_sys during mount,
351 * even if they use gss for everything else; see section 2.3.2
352 * of rfc 2623.
353 */
354 if (access & NFSD_MAY_BYPASS_GSS_ON_ROOT
355 && exp->ex_path.dentry == dentry)
356 goto skip_pseudoflavor_check;
357
358 error = check_nfsd_access(exp, rqstp);
359 if (error)
360 goto out;
361
362skip_pseudoflavor_check:
363 /* Finally, check access permissions. */
364 error = nfsd_permission(rqstp, exp, dentry, access);
365
366 if (error) {
367 dprintk("fh_verify: %s/%s permission failure, "
368 "acc=%x, error=%d\n",
369 dentry->d_parent->d_name.name,
370 dentry->d_name.name,
371 access, ntohl(error));
372 }
373out:
374 if (error == nfserr_stale)
375 nfsdstats.fh_stale++;
376 return error;
377}
378
379
380/*
381 * Compose a file handle for an NFS reply.
382 *
383 * Note that when first composed, the dentry may not yet have
384 * an inode. In this case a call to fh_update should be made
385 * before the fh goes out on the wire ...
386 */
387static void _fh_update(struct svc_fh *fhp, struct svc_export *exp,
388 struct dentry *dentry)
389{
390 if (dentry != exp->ex_path.dentry) {
391 struct fid *fid = (struct fid *)
392 (fhp->fh_handle.fh_auth + fhp->fh_handle.fh_size/4 - 1);
393 int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;
394 int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);
395
396 fhp->fh_handle.fh_fileid_type =
397 exportfs_encode_fh(dentry, fid, &maxsize, subtreecheck);
398 fhp->fh_handle.fh_size += maxsize * 4;
399 } else {
400 fhp->fh_handle.fh_fileid_type = FILEID_ROOT;
401 }
402}
403
404/*
405 * for composing old style file handles
406 */
407static inline void _fh_update_old(struct dentry *dentry,
408 struct svc_export *exp,
409 struct knfsd_fh *fh)
410{
411 fh->ofh_ino = ino_t_to_u32(dentry->d_inode->i_ino);
412 fh->ofh_generation = dentry->d_inode->i_generation;
413 if (S_ISDIR(dentry->d_inode->i_mode) ||
414 (exp->ex_flags & NFSEXP_NOSUBTREECHECK))
415 fh->ofh_dirino = 0;
416}
417
418static bool is_root_export(struct svc_export *exp)
419{
420 return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;
421}
422
423static struct super_block *exp_sb(struct svc_export *exp)
424{
425 return exp->ex_path.dentry->d_inode->i_sb;
426}
427
428static bool fsid_type_ok_for_exp(u8 fsid_type, struct svc_export *exp)
429{
430 switch (fsid_type) {
431 case FSID_DEV:
432 if (!old_valid_dev(exp_sb(exp)->s_dev))
433 return 0;
434 /* FALL THROUGH */
435 case FSID_MAJOR_MINOR:
436 case FSID_ENCODE_DEV:
437 return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;
438 case FSID_NUM:
439 return exp->ex_flags & NFSEXP_FSID;
440 case FSID_UUID8:
441 case FSID_UUID16:
442 if (!is_root_export(exp))
443 return 0;
444 /* fall through */
445 case FSID_UUID4_INUM:
446 case FSID_UUID16_INUM:
447 return exp->ex_uuid != NULL;
448 }
449 return 1;
450}
451
452
453static void set_version_and_fsid_type(struct svc_fh *fhp, struct svc_export *exp, struct svc_fh *ref_fh)
454{
455 u8 version;
456 u8 fsid_type;
457retry:
458 version = 1;
459 if (ref_fh && ref_fh->fh_export == exp) {
460 version = ref_fh->fh_handle.fh_version;
461 fsid_type = ref_fh->fh_handle.fh_fsid_type;
462
463 ref_fh = NULL;
464
465 switch (version) {
466 case 0xca:
467 fsid_type = FSID_DEV;
468 break;
469 case 1:
470 break;
471 default:
472 goto retry;
473 }
474
475 /*
476 * As the fsid -> filesystem mapping was guided by
477 * user-space, there is no guarantee that the filesystem
478 * actually supports that fsid type. If it doesn't we
479 * loop around again without ref_fh set.
480 */
481 if (!fsid_type_ok_for_exp(fsid_type, exp))
482 goto retry;
483 } else if (exp->ex_flags & NFSEXP_FSID) {
484 fsid_type = FSID_NUM;
485 } else if (exp->ex_uuid) {
486 if (fhp->fh_maxsize >= 64) {
487 if (is_root_export(exp))
488 fsid_type = FSID_UUID16;
489 else
490 fsid_type = FSID_UUID16_INUM;
491 } else {
492 if (is_root_export(exp))
493 fsid_type = FSID_UUID8;
494 else
495 fsid_type = FSID_UUID4_INUM;
496 }
497 } else if (!old_valid_dev(exp_sb(exp)->s_dev))
498 /* for newer device numbers, we must use a newer fsid format */
499 fsid_type = FSID_ENCODE_DEV;
500 else
501 fsid_type = FSID_DEV;
502 fhp->fh_handle.fh_version = version;
503 if (version)
504 fhp->fh_handle.fh_fsid_type = fsid_type;
505}
506
507__be32
508fh_compose(struct svc_fh *fhp, struct svc_export *exp, struct dentry *dentry,
509 struct svc_fh *ref_fh)
510{
511 /* ref_fh is a reference file handle.
512 * if it is non-null and for the same filesystem, then we should compose
513 * a filehandle which is of the same version, where possible.
514 * Currently, that means that if ref_fh->fh_handle.fh_version == 0xca
515 * Then create a 32byte filehandle using nfs_fhbase_old
516 *
517 */
518
519 struct inode * inode = dentry->d_inode;
520 struct dentry *parent = dentry->d_parent;
521 __u32 *datap;
522 dev_t ex_dev = exp_sb(exp)->s_dev;
523
524 dprintk("nfsd: fh_compose(exp %02x:%02x/%ld %s/%s, ino=%ld)\n",
525 MAJOR(ex_dev), MINOR(ex_dev),
526 (long) exp->ex_path.dentry->d_inode->i_ino,
527 parent->d_name.name, dentry->d_name.name,
528 (inode ? inode->i_ino : 0));
529
530 /* Choose filehandle version and fsid type based on
531 * the reference filehandle (if it is in the same export)
532 * or the export options.
533 */
534 set_version_and_fsid_type(fhp, exp, ref_fh);
535
536 if (ref_fh == fhp)
537 fh_put(ref_fh);
538
539 if (fhp->fh_locked || fhp->fh_dentry) {
540 printk(KERN_ERR "fh_compose: fh %s/%s not initialized!\n",
541 parent->d_name.name, dentry->d_name.name);
542 }
543 if (fhp->fh_maxsize < NFS_FHSIZE)
544 printk(KERN_ERR "fh_compose: called with maxsize %d! %s/%s\n",
545 fhp->fh_maxsize,
546 parent->d_name.name, dentry->d_name.name);
547
548 fhp->fh_dentry = dget(dentry); /* our internal copy */
549 fhp->fh_export = exp;
550 cache_get(&exp->h);
551
552 if (fhp->fh_handle.fh_version == 0xca) {
553 /* old style filehandle please */
554 memset(&fhp->fh_handle.fh_base, 0, NFS_FHSIZE);
555 fhp->fh_handle.fh_size = NFS_FHSIZE;
556 fhp->fh_handle.ofh_dcookie = 0xfeebbaca;
557 fhp->fh_handle.ofh_dev = old_encode_dev(ex_dev);
558 fhp->fh_handle.ofh_xdev = fhp->fh_handle.ofh_dev;
559 fhp->fh_handle.ofh_xino =
560 ino_t_to_u32(exp->ex_path.dentry->d_inode->i_ino);
561 fhp->fh_handle.ofh_dirino = ino_t_to_u32(parent_ino(dentry));
562 if (inode)
563 _fh_update_old(dentry, exp, &fhp->fh_handle);
564 } else {
565 int len;
566 fhp->fh_handle.fh_auth_type = 0;
567 datap = fhp->fh_handle.fh_auth+0;
568 mk_fsid(fhp->fh_handle.fh_fsid_type, datap, ex_dev,
569 exp->ex_path.dentry->d_inode->i_ino,
570 exp->ex_fsid, exp->ex_uuid);
571
572 len = key_len(fhp->fh_handle.fh_fsid_type);
573 datap += len/4;
574 fhp->fh_handle.fh_size = 4 + len;
575
576 if (inode)
577 _fh_update(fhp, exp, dentry);
578 if (fhp->fh_handle.fh_fileid_type == 255) {
579 fh_put(fhp);
580 return nfserr_opnotsupp;
581 }
582 }
583
584 return 0;
585}
586
587/*
588 * Update file handle information after changing a dentry.
589 * This is only called by nfsd_create, nfsd_create_v3 and nfsd_proc_create
590 */
591__be32
592fh_update(struct svc_fh *fhp)
593{
594 struct dentry *dentry;
595
596 if (!fhp->fh_dentry)
597 goto out_bad;
598
599 dentry = fhp->fh_dentry;
600 if (!dentry->d_inode)
601 goto out_negative;
602 if (fhp->fh_handle.fh_version != 1) {
603 _fh_update_old(dentry, fhp->fh_export, &fhp->fh_handle);
604 } else {
605 if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)
606 goto out;
607
608 _fh_update(fhp, fhp->fh_export, dentry);
609 if (fhp->fh_handle.fh_fileid_type == 255)
610 return nfserr_opnotsupp;
611 }
612out:
613 return 0;
614
615out_bad:
616 printk(KERN_ERR "fh_update: fh not verified!\n");
617 goto out;
618out_negative:
619 printk(KERN_ERR "fh_update: %s/%s still negative!\n",
620 dentry->d_parent->d_name.name, dentry->d_name.name);
621 goto out;
622}
623
624/*
625 * Release a file handle.
626 */
627void
628fh_put(struct svc_fh *fhp)
629{
630 struct dentry * dentry = fhp->fh_dentry;
631 struct svc_export * exp = fhp->fh_export;
632 if (dentry) {
633 fh_unlock(fhp);
634 fhp->fh_dentry = NULL;
635 dput(dentry);
636#ifdef CONFIG_NFSD_V3
637 fhp->fh_pre_saved = 0;
638 fhp->fh_post_saved = 0;
639#endif
640 }
641 if (exp) {
642 cache_put(&exp->h, &svc_export_cache);
643 fhp->fh_export = NULL;
644 }
645 return;
646}
647
648/*
649 * Shorthand for dprintk()'s
650 */
651char * SVCFH_fmt(struct svc_fh *fhp)
652{
653 struct knfsd_fh *fh = &fhp->fh_handle;
654
655 static char buf[80];
656 sprintf(buf, "%d: %08x %08x %08x %08x %08x %08x",
657 fh->fh_size,
658 fh->fh_base.fh_pad[0],
659 fh->fh_base.fh_pad[1],
660 fh->fh_base.fh_pad[2],
661 fh->fh_base.fh_pad[3],
662 fh->fh_base.fh_pad[4],
663 fh->fh_base.fh_pad[5]);
664 return buf;
665}
666
667enum fsid_source fsid_source(struct svc_fh *fhp)
668{
669 if (fhp->fh_handle.fh_version != 1)
670 return FSIDSOURCE_DEV;
671 switch(fhp->fh_handle.fh_fsid_type) {
672 case FSID_DEV:
673 case FSID_ENCODE_DEV:
674 case FSID_MAJOR_MINOR:
675 if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)
676 return FSIDSOURCE_DEV;
677 break;
678 case FSID_NUM:
679 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
680 return FSIDSOURCE_FSID;
681 break;
682 default:
683 break;
684 }
685 /* either a UUID type filehandle, or the filehandle doesn't
686 * match the export.
687 */
688 if (fhp->fh_export->ex_flags & NFSEXP_FSID)
689 return FSIDSOURCE_FSID;
690 if (fhp->fh_export->ex_uuid)
691 return FSIDSOURCE_UUID;
692 return FSIDSOURCE_DEV;
693}